.box{
    width: 500px;
    height: 500px;
    /* background-color: red; */
    border: 1px solid  red;
}
.box>div{
    display: flex;

}
.box>div div{
    width: 100px;
    height: 30px;
    border: 1px solid  blue;
    line-height: 30px;
    text-align: center;
    background: pink;
}